Does this issue only happen with this one keyboard?
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DaveJan 7 '13 at 8:31

Yes, it seems that this is keyboard specific. What I don't understand is why or how a single key is registered/mapped to two keys. This also seems to happen with the LWin and LAlt keys, and pressing either ends up registering as both keys pressed.
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JohnJan 7 '13 at 8:35

1

Well, the keyboard is faulty! Or, you have some software/driver specific to the keyboard which is creating this 'shortcut' or 'autohotkey' type of thing!
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DaveJan 7 '13 at 8:36

Although it's most likely a hardware fault, can you check if it does the same in Safe Mode as well?
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KaranJan 7 '13 at 21:26